The Envelope tool is at the top right corner of your page. It has three uses:
You can put an item to the Envelope by dragging it with the mouse. Envelope icon changes to show whether there is anything in the Envelope. When an item is put into the Envelope, it is not removed from its folder. Neither is it removed when the Envelope is used to copy or e-mail items. It is only when the Envelope is used to move items to another folder or Trash, that the items are moved.
If you want an item to be in the Envelope, but are not sure, whether it's already there, drag it to the Envelope again. There will be no duplicates in the Envelope anyway.
To clear the Envelope, drag it onto the Trash Bin icon or click on the Envelope icon and select Clear. The Envelope will become empty, but all the items that were in it will remain in their respective folders.
To see the list of items already in the Envelope, click on the Envelope and select E-mail the envelope button. You'll see a new e-mail message with Envelope contents inserted. Upon reviewing the contents, you can dismiss the message without sending it by clicking Cancel.
See also: